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SCNM Oldie!
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I was told that they help the engine run a bit smoother coz the plugs are slightly colder, but the benefit only really comes into play when the engine is modified. I was under the impression that the more tuned the engine the colder the plugs. But i could be very very wrong!

But i 2 would like to know the answer coz its quite an interesting yet not talked abt subject, and since they basically give life to the engine its always good to top up the old knowledge.
 
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